Microbiology

Microbes have very narrow optimum temperature ranges. Which of the following classifications of microbes are most likely to cause human disease, based on temperature requirements? hyperthermophiles thermophiles mesophiles psychrophiles Mesophiles - The temperature range of mesophiles overlaps that of normal human body temperature, allowing the greatest growth. Which of the following statements accurately describes the culture media necessary for growing Clostridium tetani? A complex mediu...

1. Microscopic examination of peripheral blood may be diagnostic for infection with each of the following parasites EXCEPT: A. Plasmodium vivax B. Trypanosoma cruzi C. Trichinella spiralis D. Wuchereria bancrofti C 2. In hookworm cases where progressive anemia is present, what additional test procedure should be performed to determine infection in stool specimens? A. Permanently stained smear B. Modified acid-fast stain C. Concentration technique D. Wet mount preparation C 3. All...

Microbiology involves the study of microscopic organisms, including protozoa, fungi, helminths, archae, viruses, bacteria. fleas protozoa, fungi, helminths, archae, viruses, bacteria A (n) ____cell will not contain organelles, such as mitochondria or a nucleus eukaryotic, huma, prokaryotic, plant prokaryotic The development of the ______ established the science of microbiology by providing a means by which microorganism could be viewed microscope What microbe is not cellular (acellular...

What is an antibiotic? A. An organism that inhibits the growth of other organisms B. A chemical that inhibits microbial growth C. A synthetic chemical that kills bacteria D. All available answers are characteristics of an antibiotic. B What does the Kirby-Bauer test assess? A. The ability of a microorganism to swim away from an antibiotic B. The ability of a microorganism to secrete an antibiotic C. The ability of an organism to mutate in the presence of an antibiotic D. The susceptibi...

Denaturation The disruption of proteins from their native state is known as __. -CHO Aldehydes are organic substances that contain a __ functional group on a terminal carbon. 1. Ethylene Oxide 2. Chlorine Dioxide Which of the following compounds are commonly used as gaseous sterilants or disinfectants? Heat Prions are very resistant to inactivation by __ and chemicals. True True or False: Death involves the permanent termination of a particular organism's vital processes. Death __...

One of the earliest researchers to explore the use of chemicals to kill microbial pathogens was Koch. Hooke. Fleming. Ehrlich. Ehrlich The arsenic compound that proved highly effective in treating syphilis was called penicillin. sulfa. erythromycin. Salvarsan Salvarsan The first example of an antimicrobial drug synthesized in the laboratory was penicillin. sulfa. erythromycin. Salvarsan. Salvarsan Prontosil effectively acted on streptococci when the drug was split by enzy...

B 1) The following steps are used to make DNA fingerprints. What is the third step? A) Collect DNA. B) Digest with a restriction enzyme. C) Perform electrophoresis. D) Lyse cells. E) Add stain. B 2) How many pieces will EcoRI produce from the plasmid shown in Figure 9.1? A) 1 B) 2 C) 3 D) 4 E) 5 D 3) In Figure 9.1, after digestion with the appropriate restriction enzyme, what is the smallest piece containing the ampicillin-resistance (amp) gene? A) 0.17 kilobase pairs B) 0.25 kb...

Peptidoglycan is a polymer of millions of N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) sugars based on glucose molecules linked together in long chains cross-braced with four amino acids that link individual polymer chains together in a chain-link fence pattern. Layers of cross-braced NAG and NAM sheets are stacked vertically and held together by proteins with lipid anchors attached to the cell's cytoplasmic membrane to form a scaffold of sugars and proteins that is able to hold t...

1. Infection occurs when: A) contaminants are present on the skin B) a person swallows microbes in/on food C) a person inhales microbes in the air D) pathogens enter and multiply in body tissues E) all of the choices are correct pathogens enter and multiply in body tissues 2. All infectious diseases: A) are contagious B) only occur in humans C) are caused by microorganisms or their products D) are caused by vectors E) involve viruses as the pathogen are caused by microorganisms or t...

A. chemoautotroph Which of the following is an organism that obtains its energy from the transfer of electrons originating from chemical compounds and its carbon from an inorganic source? A. chemoautotroph B. chemoheterotroph C. photoheterotroph D. photoautotroph D.NADPH Which of the following molecules is reduced? A. NAD+ B. FAD C. O2 D. NADPH B. reducing the activation energy Enzymes work by which of the following? A. increasing the activation energy B. reducing the activation e...